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$\sqrt{\text{-} a}= \sqrt{a} \cdot i$
The square root of a negative number is not real, but it can be written as an imaginary number. $\sqrt{\text{-}4}=\sqrt{4}\cdot i=2i$ Thus, the square root of $\text{-} a$ can be written as the square root of $a$ multiplied by the imaginary unit.